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Arsenic emission from coal combustion power plants has attracted increasing attention due to its high toxicity. In this study, it was found that there was a close relationship between the ash fusion temperature (AFT) and arsenic distribution based on the thermodynamic equilibrium calculation. In addition to the AFT, coal characteristics and combustion temperature also considerably affected the distribution and morphology of arsenic during coal combustion. Thus, an arsenic volatilization model based on the AFT, coal type, and combustion temperature during coal combustion was developed. To test the accuracy of the model, blending coal combustion experiments were carried out. The experimental results and published data proved that the developed arsenic volatilization model can accurately predict arsenic emission during co-combustion, and the errors of the predicted value for bituminous and lignite were 2.3–9.8%, with the exception of JingLong (JL) coal when combusted at 1500 °C.

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The influence of the Co/SBA-15 catalyst texture, such as pore size and pore length on Fischer-Tropsch (FT) Synthesis, was investigated in this paper. The morphology, structure, and microstructures of Co/SBA-15 catalysts were characterized by SEM, Brunauer-Emmett-Teller (BET), TPR, HRTEM, and XRD. The experimental results indicated that the increase of pore size could improve the activity of the Co/SBA-15 catalyst, and the further increase of pore size could not significantly promote the activity. Moreover, it was also found that the pore length of the Co/SBA-15 catalyst played a key role in the catalytic activity. CO 2 and C4+ selectivity were 2.0% and 74% during the simulated syngas (64% H 2 : 32% CO: balanced N 2 ) FT over the Co/SBA-15 catalysts, and CO conversion rate and CH 4 selectivity were 10.8% and 15.7% after 100 h time on stream.2 of 11 has uniform hexagonal channels and high thermal stability. The above features of SBA-15 lead to it being regarded as a suitable support for FTS catalyst [16]. Cai et al. and Wang et al. reported that the CO conversion was 6.51%-20.51%, and C 5+ selectivity was 42.43%-77.14% when Ru promoted Co/SBA-15 catalysts was used in FTS [17,18]. García et al. explored the effects of the Co-SiO 2 interaction, and thought that SBA could suppress the aggregation of metal particles and promote the metal dispersion [19].In this paper, the effect of the texture of Co/SBA-15 on FTS performance was investigated. Moreover, the reaction temperature and Co loading were also discussed. Results and DiscussionSEM images of SBA-15 are presented in Figure 1. SBA-15 consisted of aligned rod-like particles with a diameter of 1 µm and a length of 2-3 µm longwise, which coincided with the results of Prieto et al. [20]. It could be clearly observed from Figure 2 that SBA-15 had a well-ordered hexagonal crystal structure composed of one-dimensional channels, which was highly ordered and stable [21].Catalysts 2018, 8, x FOR PEER REVIEW 2 of 12

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