柴油催化裂解制备高选择性“翡翠氢”

李博凡 ,  焦瑞敬 ,  崔超婕 ,  于翔 ,  汪剑 ,  马云海 ,  骞伟中 ,  金涌

工程(英文) ›› 2025, Vol. 55 ›› Issue (12) : 175 -181.

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工程(英文) ›› 2025, Vol. 55 ›› Issue (12) : 175 -181. DOI: 10.1016/j.eng.2025.03.041
研究论文

柴油催化裂解制备高选择性“翡翠氢”

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Highly Selective Production of “Jadeite Hydrogen” from the Catalytic Decomposition of Diesel

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摘要

在碳中和背景下,清洁氢(H2)能是社会可持续发展的重要支撑。然而,当前绿氢、蓝氢主要依赖水电解与甲烷(CH4)蒸汽重整技术制备,受限于制备成本高、技术难放大及操作风险高等问题,其产能难以提升。本研究提出柴油在纳米铁基催化剂作用下催化裂解制备“翡翠H2”的清洁路线,并将柴油中的碳元素以碳纳米管(CNTs)形式固定。通过调控催化剂类型、空速及反应时间等参数,系统探究副产物CH4的抑制机理。该技术的绿色指数(定义为GI,指H2与含碳气态产物的摩尔比)最大值超过42,远优于以往报道的化学气相沉积(CVD)方法。此外,其碳足迹(CFP)显著低于灰氢、蓝氢及其他制氢技术。与上述技术相比,本技术在能耗(基于每摩尔氢气)与反应器放大方面更高效且更具可行性。

Abstract

Clean hydrogen (H2) is highly desirable for the sustainable development of society in the era of carbon neutrality. However, the current capability of water electrolysis and steam methane (CH4) reforming to produce green and blue H2 is very limited, mainly due to the high production cost, difficult scale-up technology, or operational risk. Here, we propose the direct catalytic decomposition of diesel using a nano-Fe-based catalyst to produce the so-called “jadeite H2,” while simultaneously fixing the carbon from the diesel in the form of carbon nanotubes (CNTs). Efforts are made to understand the suppression mechanism of the CH4 byproduct, such as by tuning the catalyst type, space velocity, and reaction time. The optimal green index (GI)—that is, the molar ratio of H2/carbon in a gaseous state—of the proposed technology exceeds 42, which is far higher than those of any previously reported chemical vapor deposition (CVD) method. Moreover, the carbon footprint (CFP) of the proposed technology is far lower than those of grey H2, blue H2, and other dehydrogenation technologies. Compared with most of the technologies mentioned above, the energy consumption (per mole of H2) and reactor amplification of the proposed technology validate its high efficiency and great practical feasibility.

关键词

翡翠氢 / 制氢 / 绿色指数 / 碳纳米管

Key words

Jadeite hydrogen / Hydrogen production / Green index / Carbon nanotubes

引用本文

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李博凡,焦瑞敬,崔超婕,于翔,汪剑,马云海,骞伟中,金涌. 柴油催化裂解制备高选择性“翡翠氢”[J]. 工程(英文), 2025, 55(12): 175-181 DOI:10.1016/j.eng.2025.03.041

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1 引言

绿氢(H2)不仅可用于化学品清洁加氢反应,还能直接作为交通燃料及家庭烹饪能源,是实现碳中和的关键支撑[14]。绿氢的理想制备路径是利用可再生能源(太阳能、风能)驱动水电解[56],但目前该技术的产能远低于化石燃料(煤炭、天然气以及柴油等液体燃料)制备的灰氢(图1),全球灰氢年产量超过5×107 t [23]。工业上灰氢的制备常需水(H2O)或氧气(O2)的辅助转化,导致大量二氧化碳(CO2)排放[79]。通过化学气相沉积法(CVD)的烃类直接裂解,理论上可实现气相产物中仅含H2图1),但实际过程中会生成大量甲烷(CH4),其温室效应强度远超CO2 [12]。更关键的是,大多数烃类CVD裂解为高温吸热反应,需消耗大量能源,造成大量间接CO2排放(即燃料燃烧供能过程的排放)。

本文提出以廉价柴油[轻质循环油(LCO)]为原料直接催化裂解制备“翡翠H2”的新技术,该路线在热力学上有利且为放热反应。LCO主要由萘系化合物组成,氢/碳(H/C)比与煤接近。相比于多采用铑(Rh)、铂(Pt)、钯(Pd)等贵金属催化剂,通过蒸汽重整裂解制备灰氢的技术[8,1012],本技术选用廉价但高活性的纳米级铁(Fe)基催化剂,将LCO高选择性转化为H2和碳纳米管(CNTs)。本文定义氢气与甲烷等气态烃的摩尔比为绿色指数(GI),用于量化不同制氢技术的清洁度。与已报道的烃类CVD裂解制H2相比,本技术GI值最高。此外,与甲烷热解(MP)制备绿松石氢、化石能源辅助水电解制备H2等工业路线相比,本技术具有能耗低、操作温度温和的优势,实际可行性强。同时,与烃类CVD转化法相比,本技术副产的CNTs能够有效分担碳排放量,使得碳足迹(CFP)值降至最低,实现净零碳甚至负碳效应。柴油产量丰富,且具有高密度和易运输的优点[1314],因此本技术制备的清洁H2有望成为一种分布式清洁氢源,在可再生能源水电解获取绿氢的产能完全释放前,有效填补当前绿氢的市场缺口,助力实现碳中和目标。

2 材料和方法

2.1 Fe/Mo/Al2O3催化剂的制备

采用共沉淀法制备纳米级Fe基催化剂。首先,将Fe(NO3)3·9H2O和Al(NO3)3·9H2O溶解于500 mL去离子水中,同时将(NH4)6Mo7O24·4H2O和(NH4)2CO3溶解于200 mL水中。随后在80~100 ℃下将两种溶液混合搅拌,搅拌速度为1.5 g∙min-1。生成沉淀后过夜,用去离子水洗涤5次以去除NH4+,过滤得到沉淀物。沉淀物在120 ℃下干燥12 h,并在450 ℃下煅烧6 h,最终制得Fe∶Mo∶Al2O3摩尔比为4∶5∶15的催化剂。镍(Ni)基催化剂的制备参照文献[15]中报道的方法。

2.2 翡翠氢和碳纳米管的制备

以LCO为碳源,氮气(N2)为惰性载气。将10~30 g催化剂粉末置于内径为50 mm的不锈钢流化床(FB)反应器中,反应温度为700~800 ℃,空速为0.025~0.15 h-1,反应器出口压力为环境压力。收集的固体产物用200 mL盐酸(10 wt%)浸泡24 h,再用50 mL去离子水洗涤3次,120 ℃下干燥4 h,最终得到CNTs产物。为了验证本技术的高GI值(原料为LCO),同时选择了1-甲基萘、液化石油气(LPG)和戊烷作为碳源进行对比实验。

2.3 表征

反应过程中每30 min采集一次气相产物,使用在线气相色谱仪(Agilent 7890B, Agilent,美国)进行组分分析。通过扫描电子显微镜(SEM; GSM-7401; JEOL,日本)和透射电子显微镜(TEM; JEM-2010; JEOL,日本)观察固体产品的形貌;利用拉曼光谱仪(Labram-800; HORIBA JOBIN YVON,法国)表征碳纳米管的结构。采用TGA/DSC 1同步热分析仪(STARe; Mettler Toledo,瑞士)测定碳纳米管的纯度。利用X射线衍射仪(XRD; D8 Advance; Bruker,德国)分析催化剂和固体产物的结构。通过程序升温还原(H2-TPR)和程序升温脱附(NH3-TPD)(Chembet PULSAR TPR/TPD,美国)表征催化剂的氧化还原性与酸性。利用X射线光电子能谱仪(250XI, Thermo Scientific,美国)分析催化剂的表面结构。

3 结果和讨论

3.1 柴油催化分解中的技术问题

图2(a)所示,翡翠氢通过流化床化学气相沉积法(FB-CVD)制备。原料LCO [一种由C10~C20的烷烃、烷基苯、萘、联苯、蒽和菲等组成的液态混合物;详见图2(b)和附录A中的表S1]从反应器底部进入,在700~800 ℃下通过纳米级Fe/Mo/Al2O3催化剂[图2(c)和附录A中的图S1]时裂解,高效制备碳纳米管和气相产物[主要是H2和CH4图2(a)]。固相产物主要为外径为8~15 nm、内径为6~10 nm的多壁CNTs [图2(d)和(e)]。如图2(f)所示,CNTs纯度约为84%,热重分析(DTG)曲线在470 ℃处出现失重峰,表明没有生成无定形碳。如图2(g)所示,CNTs产物拉曼光谱中D峰与G峰的强度比约为0.5~0.6,2D峰的峰值强度较高,2D/G峰强度比也较大(0.57)。以上结果表明利用LCO成功制备了高质量(即缺陷较少)的CNTs [1617]。

由于CNTs是由LCO裂解制备的,因此Fe基催化剂表现出极高的活性[图3(a)和(b)]。气体产物分布随反应时间的变化而变化[图3(a)]。反应初期甲烷(CH4)选择性为25%,但在1 h内迅速降低到2%,并在1~12 h内保持在低水平。此外,在反应过程中,其他C2~C6烃的体积比低于0.1%。根据质量守恒定律,碳(C)、氢(H)和硫(S)的质量平衡分别为86.2%、136.3%和94.4%(附录A中的表S2)。以1-甲基萘作为原料时,C3~C5烃得到有效转化,而LCO组分复杂,使得C2~C6烃类副产物转化为碳纳米管和氢气更具挑战(附录A中的图S2)。产物分布的稳定性表明催化剂活性优异,无明显失活趋势。

LCO通过CVD转化的过程中,主反应为气-液-固(VLS)机理下碳-碳键的断裂并逐渐脱氢生成纯碳产物[1820];副反应是中间产物加氢,形成CH4、乙烯(C2H4)、乙烷(C2H6)和丙烯(C3H6)等。其中,高活性的C2~C6烃生成后可进一步转化为碳产物与H2 [2124],因此,抑制CH4副产物的生成是实现高选择性H2的关键。

相比之下,Ni基催化剂也能有效地将LCO转化为CNTs(附录A中的图S3至图S5)。如图3(c)和(d)所示,Ni基催化剂裂解LCO产生的气态产物组成类似,但选择性存在差异。反应初期,CH4选择性为10%,略优于Fe基催化剂,随后从10%(反应1 h)持续增加到20%(反应10 h)、30%(12 h)。同时,氢气初始选择性仅为87%,在10 h后逐渐降低至80%,12 h后进一步降低到60%。值得注意的是,LCO在反应12 h后完全转化,但H2的选择性急剧下降。如附录A中的图S5所示,Ni基催化剂制备的CNTs直径更大(20~60 nm),大于Fe基催化剂的产物直径(8~15 nm)。拉曼光谱也表明Ni基催化剂制备的CNTs,其D峰与G峰的强度比(ID/IG)高于Fe基催化剂制备的CNTs,缺陷程度更高(附录A中的图S6)。

CH4和其他烃类副产物都属于挥发性有机化合物,且其温室效应远高于二氧化碳。为此,本研究将烃类产物总摩尔比折算为甲烷当量(CH4 eq)进行控制,并定义H2与CH4 eq的摩尔比为GI。GI值不仅从原子经济的角度反映催化剂或工艺的效率,也可用于评估不同制氢工艺的碳排放水平。

具体而言,当LCO的空速为0.05 h-1时[图3(e)],Fe基催化剂作用下GI最大值接近42;将空速提高至0.15 h-1时,GI最大值降低至20,表明提高空速会导致过量碳与金属催化剂结合形成金属碳化物。碳扩散不足及碳沉淀加剧了竞争性加氢反应,带来副产物CH4 [1718,20]。同样,将反应时间延长至12 h,催化剂的状态发生变化,在空速0.025 h-1下,GI最大值为25。显然,随着失活,催化剂的碳扩散和碳沉淀能力逐渐减弱,进一步加剧竞争性加氢反应,甲烷生成量显著增加。

图3(e)所示,Ni基催化剂的GI值几乎不超过6,并随着反应时间的增加持续下降,反应12 h后降低至2.7。在已报道的催化剂克级及以上规模的CVD工艺中,烃类原料涵盖CH4 [2526]、C2H6 [2728]、丙烷(C3H8)[2829]等,同时获得高选择性的氢气和高质量的CNTs极具挑战性。如图3(f)和附录A中的表S3所示,已报道工艺的GI值多集中在2~7之间。本研究中Ni基催化剂的GI值也处于此范围内,但Fe基催化剂的GI值则远超该范围[图3(f)] [2532]。GI值越高,表明该技术制备的氢气越清洁。与其他制氢技术(附录A中的图S7)相比,本文报道的柴油催化裂解技术展现出最优GI值(5~42),高于灰氢(1~3)[6,3337]、绿松石氢(5~7)[5]和蓝氢(3~13)[5,33],仅低于水电解制氢(1~∞)[56,33]。理论上,采用绿电制备绿氢,其GI值趋于无穷大。鉴于本技术制备的氢气具有极高绿色性,其GI值为5~42,故将其命名为“翡翠氢”。

质量平衡计算显示,LCO经Fe基催化剂转化后,产物质量比为:91% CNTs、7% H₂和2% CH4 [图3(b)],对应摩尔比为:67% CNTs、32% H2和1% CH4。相比之下,Ni基催化剂的产物质量比为:82% CNTs、6% H₂和12% CH4 [图3(d)],对应摩尔比为:64% CNTs、29% H2和7% CH4。因此,Fe基催化剂显著优于Ni基催化剂,能够在抑制CH4生成的同时获得高比例的CNTs与H2产物。

3.2 不同制氢技术的碳足迹对比

不同制氢技术的产物存在差异,本研究采用生命周期法计算并对比各技术的CFP值(单位为t CO2·t-1产品)。如图4(a)[46,3345]和附录A中的表S4所示,煤气化工艺的CFP值最高(29.33 t CO2·t-1产品),因为煤中氢含量较低且气化过程的能耗较高[33,38]。其次,甲烷蒸汽重整(SMR)工艺的CFP值约为7.33~21.86 t CO2·t-1产品[37,40,46]。相比之下,丙烷脱氢(PDH)和乙烷脱氢(EDH)的CFP值为1.4~3.01 t CO2·t-1产品,因为生成的C2~C3烯烃产物能够分担碳排放[4245]。CH4热解制备绿松石氢的单程转化率较低,且其循环转化会消耗大量能量[4748],因此其CFP值为0.83~5.54 t CO2·t-1产品[5,40]。值得注意的是,甲烷和煤电制备的蓝氢并非预期的清洁,假设通过碳捕集、利用与封存技术(CCUS)捕获并封存了56%~90%的CO2,则其碳足迹值在0.92~19.26之间显著变化[6,37,3940]。利用灰电(#1)进行水电解制备的氢气同样也不够清洁,其CFP值为7~39.52 t CO2·t-1产品[34,39]。只有利用绿电(#2)可将CFP值大幅降低至0.1 t CO2·t-1。本技术中,CNTs产物质量比高,能够分担碳排放,因此其CFP值仅为0.27~0.30 t CO2·t-1产品。此外,本技术所用LCO原料硫元素含量为6960 µg∙g-1,而本文中CFP计算并未考虑脱硫的能耗,因为脱硫后LCO催化裂解制备的氢气绿色指数会更高,能够抵消脱硫反应能耗。尽管LCO和煤的氢碳比相近,但生成的碳产物的不同,导致LCO的直接裂解和煤气化工艺的CFP值截然不同,未来应用有望实现负碳效应。

3.3 关于能耗和反应器规模放大的实际可行性评估

从操作温度和能耗(以单位摩尔H2计)两方面评估本技术的实际可行性。首先,不同制氢工艺的操作温度关联结果显示[图4(a)],操作温度越高,热回收利用的能量损失越大,能耗与CO2排放量也越高。与MP、SMR和煤气化制氢相比,本工艺的操作温度较低(700~800 ℃),更易实现工业化。其次,通过HSC Chemistry软件计算各工艺的吉布斯自由能变(ΔG)和焓变(ΔH)[图4(b)和(c)]。LCO由四种集总组分组成:烷烃(19.2%)、苯系物(18.4%)、萘系化合物(58.3%)和菲系化合物(4.1%)。每种集总组分转化为碳和H2时,其ΔG均为负值;其中前两种集总组分的转化是吸热反应(ΔH>0),而后两种为放热反应(ΔH<0)[图4(b)]。结合各组分的质量比及高GI值,LCO转化总焓变ΔH(-4.8 ~ -8.5 kJ∙mol-1 H2)略小于零,对应ΔG为-98 ~ -107 kJ∙mol-1 H2 [图4(c)和附录A中的表S5]。如图4(c)所示,本技术是所有制氢工艺中唯一的放热反应。其他吸热制氢工艺ΔH的顺序为:水电解(>300 kJ∙mol-1 H2)>>PDH、EDH和煤气化(120~130 kJ∙mol-1 H2)>SMR(<60 kJ∙mol-1 H2)。SMR、MP、EDH和煤气化制氢工艺的ΔG值虽为负值但数值较小,水电解和PDH的ΔG值为正值,表明其在操作条件下是非自发反应。LCO自发放热裂解源于其低氢碳比,化学平衡受H2的影响小于MP工艺,且LCO氢含量较低,这是本工艺绿色指数高于其他烃类CVD转化过程的重要原因[图3(f)]。上述热力学分析结果表明,本技术具有较高的自发性和可行性。

反应器一直是清洁氢规模化生产的主要瓶颈。本文对比了LCO裂解与水电解反应器,因为这两种技术获得的氢气产物具有相似的质量比(9%~11%)。如图4(d)和附录A中的表S6所示,碱性水电解槽(AWE)的时空收率为22.65~31.36 m3 H2∙m-3(即每立方米反应器可产生的氢气体积),产能为500~1500 Nm3∙h-1 H2;而流化床(FB)反应器的时空收率为29.49~40.44 m3 H2∙m-3,产能为500~10 000 Nm3∙h-1 H2。两种工艺的H2时空收率相近,但单个FB反应器的绝对产能可能是AWE的60~100倍,规模化生产更具优势。图4(d)从能耗、单个反应器产能、H2时空收率和产品成本四方面总结,证明了本技术未来的应用潜力显著。以中国为例,LCO每年产量超过4000万吨,若完全裂解每年可生产3×106 t H2,约占中国当前H2总产量(3×107~3.5×107 t∙a-1)的近9%~10%。结合现有炼厂分布及柴油易运输的特性,翡翠氢可以满足本地炼厂的加氢需求,节省储存和运输成本,或可用于构建分布式清洁氢供应网络。

4 结论

本研究开发柴油高选择性制备清洁H2的新路线,并提出了绿色指数(GI,H2/CH4 eq摩尔比,也等于H2/CO2摩尔比),用于评估不同制氢技术的绿色程度。本研究中,基于纳米级Fe基催化剂技术的GI最佳值高达42,反应12 h GI平均值超过25。对比研究表明,H2选择性受催化剂类型、空速和催化剂失活趋势影响。与工业灰氢、蓝氢、PDH、EDH等工艺以及以灰电进行水电解制氢相比,本技术具有最高的GI值和最低的CFP值,单位摩尔H2能耗与反应器放大计算也表明本技术易于规模化且具备经济竞争力。

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