Co-thermal in situ hydrogenation of cement raw material to synthetic gas
The cement industry is the world's third largest energy consumer and second largest CO2 emitter,accounting for 7％of global CO2 emissions.Cement raw material(mixture of CaCO3,Fe2O3,Al2O3 and SiO2)was calcined at high temperature(＞900 ℃)to ob-tain cement clinker,which had high energy consumption and releases a huge amount of CO2.Based on the dual-carbon background,this paper prepared cement raw material by ball milling method,adopted the innovative strategy of carbonate co-thermal coupling in situ hy-drogenation reduction,and realized the in situ hydrogenation of cement raw material to produce CO at 700℃.The selectivity reaches 94.8％,and the CO generation rate reaches 0.76 mmol/min.The pyrolysis temperature of carbonate is significantly reduced,CO2 emission is inhibited,and uniformly porous CaO particles are obtained.X-ray powder diffraction(XRD),specific surface area(BET),scanning electron microscopy(SEM),Raman spectroscopy(Raman)and in situ diffuse Fourier transform infrared spectroscopy(In situ DRIFTS)and other characterization methods were used to investigate the effects of reaction temperature and different ponents(Fe,Si and Al)on the hydrogenation performance of carbonate.The results show that Fe helps to improve the selectivity of CO products and produce a small amount of methane,and the addition of Si and Al elements reduces the rate of carbonate hydrogenation.In situ DRIFTS indicate that CO generation from cement raw material hydrogenation may follow the formate intermediate species mechanism.Synthetic gas is prepared by in situ hydrogenation of cement raw materials through co-thermal coupling.This study can reduce consumption and increase efficiency at the source of cement industry,and provide a new strategy and theoretical basis for the preparation technology of low-carbon cement clinker.
cement raw materialcarbonateco-thermal couplingcarbon reductionsynthesis gas
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维普
