Bifunctional catalyst for petroleum residue cracking gasification
Bifunctional catalyst for petroleum residue cracking gasification
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石油渣油裂解气化双功能催化剂
DOI：
10.1016/j.fuel.2013.07.048
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发表时间：
2014-01
期刊：
影响因子：
7.4
通讯作者：
Guangwen Xu
中科院分区：
文献类型：
--
作者：
Yuming Zhang;Deping Yu;Wangliang Li;Shiqiu Gao;Guangwen Xu
渣油裂解气化（RCG）工艺是将重油催化裂解为裂解液，裂解后的焦炭催化气化为合成气。本文合成了一种双功能催化剂（BFC），并在实验室流化床反应器上进行了渣油裂解气化试验，并与FCC催化剂进行了性能对比。由于新鲜BFC和FCC催化剂的酸性较强，因此活性较强，减压渣油（VR）裂解液体产率较低。因此进行水热处理以减弱两种催化剂的酸性。这导致约80重量%的液体产率。在500 °C下裂解相同的VR。在相同的流化床反应器中，通过形成的焦炭的水蒸气气化来原位再生BFC和FCC废催化剂。这同时产生含有高达80体积%的CO和H2的合成气，在800 °C时，两种催化剂的碳转化率均超过95%。然而，BFC的再生时间大大短于FCC催化剂。这表明BFC对焦炭气化的催化活性明显高于几乎没有催化活性的FCC。事实上，BFC比FCC含有更多的活性碱金属位点，以确保其气化催化活性。
The so-called petroleum residue cracking gasification (RCG) process intends to convert the heavy oil first into cracked liquid by catalytic cracking and then into syngas via catalytic gasification of the cracking-formed coke. A bifunctional catalyst (BFC) was synthesized in this article and tested for the petroleum residue cracking gasification in a laboratory-scale fluidized bed reactor through comparison with the performance over an FCC catalyst. Low liquid yield of vacuum residue (VR) cracking was obtained with fresh BFC and FCC catalysts because of their strong acidity and thus activity. Hydrothermal treatment was thus performed to weaken the acidity of both the catalysts. This resulted in liquid yields of about 80 wt.% at 500 °C for cracking the same VR. The spent BFC and FCC catalysts were both in situ regenerated via steam gasification of the formed coke in the same fluidized bed reactor. This generated simultaneously syngas which contained CO and H2of up to 80 vol.%, and the realized carbon conversion was over 95% at 800 °C for both the catalysts. However, the regeneration time for BFC was greatly shorter than that for the FCC catalyst. This shows the much better activity of BFC for coke gasification in comparison with FCC that has almost no activity for catalyzing coke gasification. In fact, the BFC contained much more active alkaline metal sites than the FCC to ensure its catalytic activity for gasification.
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