Effect of Double Transition Metal Salt Catalyst on Fushun Oil Shale Pyrolysis.

Xiaoyang Liu,Chuang Guo,Xiaojing Di,Hongxiang Hu,Haodan Pan

doi:10.1155/2020/6685299

Abstract

Shale ash (SA) as the carrier, the ratio of Cu to Ni in the Cu-Ni transition metal salt being, respectively, 1 : 0, 2 : 1, 1 : 1, 1 : 2, 0 : 1, the double transition metal salt catalyst (CumNin/SA) was prepared to explore the effect of such catalysts on the pyrolysis behavior and characteristics of Fushun OS. The research results show that the temperature (Tmax) corresponding to the maximum weight loss rate decreased by 12.9°C, 4.0°C, and 3.6°C; and the apparent activation energy decreased by 35.2%, 33.9%, and 29.6%, respectively, after adding catalysts Cu0Ni1/SA in pyrolysis. The addition of Cu0Ni1/SA and Cu2Ni1/SA further improves the shale oil (SO) yield of 3.5% and 3.1%, respectively. Cu0Ni1/SA produces more aromatic hydrocarbons, which, however, weakens the stability of SO and is of toxicity in use. After analyzing the pyrolysis product—semicoke (SC) and SO—with ATR-FTIR and GC-MS methods, CumNin/SA promotes the secondary cracking and aromatization of OS pyrolysis, increasing the content of the compound of olefins and aromatics in SO, and hastening the decomposition of long-chain aliphatic hydrocarbons to short-chain aliphatic hydrocarbons.

Highlights

With the shortage of traditional energy resources against the increasing oil demand, oil shale is considered to be a type of ideal alternative energy source to substitute oil owing to its abundant reserves
This stage can be considered as the oil production stage in oil shale (OS) pyrolysis [12], where a series of complex reactions including ring-opening reaction, depolymerization reaction, and repolymerization reaction [17, 18] would occur when the temperature rose to a certain level
After analyzing the pyrolysis characteristics of OS containing a different ratio of Cu to Ni with thermogravimetric analyzer-mass spectrometry (TG-MS) technology method pyrolysis product shale oil (SO) under methods including FTIR and GC-MS, the conclusions are presented as follows: (1) The effects of shale ash (SA) and CumNin/SA on the pyrolysis characteristics of Fushun OS were investigated by thermogravimetry

Summary

Introduction

With the shortage of traditional energy resources against the increasing oil demand, oil shale is considered to be a type of ideal alternative energy source to substitute oil owing to its abundant reserves. Jiang et al [12] and Pulushev et al [13] studied the effects of pyrolysis conditions and transition metals on the pyrolysis products and characteristics of Huadian oil shale, finding that the addition of transition metal cobalt salts to OS increases the selectivity of aromatics and promotes the aromatization of olefins. Chang et al [14] studied the effects of FeCl2·4H2O, CoCl2·6H2O, NiCl2·6H2O, and ZnCl2 on the pyrolysis of OS, summarizing that all these four metal salts enhance the secondary cracking of shale oil, reduce oil production, and improve the pyrolysis gas production. All these studies affirm that catalyst increases either the pyrolysis conversion rate or product yield. The components of pyrolysis product shale oil (SO) were analyzed by ATR-FTIR and GC-MS, while the effects of the catalyst on the activation energy of OS pyrolysis were analyzed by the Coats Redfern model

Experimental Materials and Methods

Effect of Transition Metal Salt Catalysts on OS Pyrolysis

Component Analysis

Conclusion

C28 C30 C32C34