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Co-production of hydrogen and carbon nanofibers from methane decomposition over zeolite Y supported Ni catalysts

机译：在沸石Y负载的Ni催化剂上甲烷分解产生的氢和碳纳米纤维联产

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The objective of this paper is to study the influences of different operating conditions on the hydrogen formation and properties of accumulated carbon from methane decomposition using zeolite Y supported 15% and 30% Ni, respectively, at a temperature range between 500 and 650 ℃ in a pilot scale fixed bed reactor. The temperature ramp was showed a significant impact on the thermo-catalytic decomposition (TCD) of methane. An optimum temperature range of 550-600 ℃ were required to attain the maximum amount of methane conversion and revealed that at 550 and 600 ℃, catalyst showed longer activity for the whole studied of experimental runs. Additionally, at 550 ℃, the methane decomposition is two times longer for 30% Ni/Y zeolite than that for 15% Ni/Y zeolite catalyst, whereas it is almost three times higher at 500 ℃. A maximum carbon yield of 614.25 and 157.54 g_c/g_(Ni) were reported after end of the complete reaction at 600 ℃ with 30% and 15% Ni/Y zeolite catalyst, respectively. From BET, TPD, and XRD analysis, we had reported that how the chemistry between the TCD of methane and metal content of the catalysts could significantly affect the hydrogen production as well as carbon nano-fibers. TEM analysis ensured that the produced carbon had fishbone type structures with a hollow core and grew from crystallites of Ni anchored on the external surface of the catalysts and irrespective of the metal loadings, the whisker types of nano filaments were formed as confirmed from FESEM analysis. Nevertheless, the effect of volume hourly space velocity (VHSV) on the methane conversion was also investigated and reported that the methane conversion increased as VHSV and nickel concentration in Ni-Y catalysts increased. Additionally, the initial methane decomposition rate increases with VHSV and it has reverse and non-linear relevancy to the weight of Ni/Y zeolite catalyst.
机译：本文的目的是研究在500〜650℃的温度范围内，Y型沸石分别负载15％和30％Ni的沸石，考察了不同操作条件对氢形成和甲烷分解产生的积碳的影响。中试规模固定床反应器。温度上升表明对甲烷的热催化分解（TCD）有显着影响。为了获得最大的甲烷转化率，需要在550-600℃的最佳温度范围内进行，并表明在550和600℃，催化剂在整个实验过程中均显示出更长的活性。此外，在550℃时，30％Ni / Y沸石的甲烷分解时间是15％Ni / Y沸石催化剂的甲烷分解时间的两倍，而在500℃时，甲烷分解的时间高出三倍。在600℃下用30％和15％的Ni / Y沸石催化剂完全反应结束后，报道的最大碳产率为614.25和157.54 g_c / g_（Ni）。通过BET，TPD和XRD分析，我们已经报道了甲烷TCD与催化剂金属含量之间的化学反应如何显着影响制氢和碳纳米纤维。 TEM分析确保所产生的碳具有带空心核的鱼骨​​型结构，并由锚定在催化剂外表面上的Ni的微晶生长而成，并且与金属负载无关，如FESEM分析所证实，形成了晶须类型的纳米丝。然而，还研究了体积时空速（VHSV）对甲烷转化率的影响，并报道甲烷转化率随VHSV和Ni-Y催化剂中镍浓度的增加而增加。此外，甲烷的初始分解速率随VHSV的增加而增加，并且与Ni / Y沸石催化剂的重量呈反相关和非线性关系。

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