Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Jiangsu 210096, China.
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Jiangsu 210096, China.
J Environ Sci (China). 2020 Aug;94:186-196. doi: 10.1016/j.jes.2020.03.014. Epub 2020 May 4.
The deactivation of catalyst is a significant reason for its limited application during the catalytic fast pyrolysis (CFP) process. To reduce the coke formation, binary compound impregnation (BCI) and chemical liquid deposition (CLD) were used to modify HZSM-5 catalysts. At the same time, the self-designed microwave reactor separated the pyrolysis of bamboo and catalytic upgrading of primary vapor, which made the catalytic effect more thorough. Experimental results indicated that CLD used TiO deposition to cover external acid sites, while BCI by phosphorus-nickel could cover and partly destroy superficial acid sites through two different ways. Within the scope of the loaded amount studied, the yield of aromatic hydrocarbons in the oil phase increased at first and then decreased, while the coke formation reduced continuously. BTX (benzene, toluene and xylene), the most valuable product in bio-oil, drastically increased by 39.1% and 22.6% respectively over the CLD and BCI modified catalysts. Considering the catalytic performance as well as cost, CLD over HZSM-5 has more advantages in the CFP process to upgrade bio-oil.
催化剂失活是其在催化快速热解（CFP）过程中应用受限的一个重要原因。为了减少积碳的形成，采用二元化合物浸渍（BCI）和化学液沉积（CLD）对 HZSM-5 催化剂进行改性。同时，自行设计的微波反应器将竹材热解与初级蒸汽的催化升级分开，使催化效果更加彻底。实验结果表明，CLD 通过 TiO 沉积覆盖外酸性位，而 BCI 通过磷镍可以通过两种不同的方式覆盖和部分破坏表面酸性位。在所研究的负载量范围内，油相芳烃的产率先增加后减少，而焦炭的形成则持续减少。BTX（苯、甲苯和二甲苯），生物油中最有价值的产品，在 CLD 和 BCI 改性催化剂上分别大幅增加了 39.1%和 22.6%。考虑到催化性能和成本，CLD 在 CFP 过程中对生物油进行升级具有更多优势。
