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Sustainable production of acrolein over highly stable and selective WO3 over SiO2-TiO2 catalysts
Boz Ismail,Boroglu Mehtap Safak,Zengin Yasar,Kaya Busra 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.8
The effects of the addition of colloidal silica (cSiO2) and solvents used in the catalyst preparation on the activity and stability of WO3-TiO2 catalysts are reported in this paper. The highly stable and selective WO3 supported cSiO2-TiO2 catalysts were prepared and tested in the vapor-phase glycerol oxy-dehydration. WO3-TiO2 catalysts with and without cSiO2 were characterized by XRD, SEM, NH3-TPD, infrared spectroscopy of pyridine (FTIR-Py), XPS, RAMAN, and N2 adsorption-desorption (BET). The highest medium strength acidity and optimum Brønsted to Lewis acid site ratio of WO3 catalysts were achieved upon the addition of colloidal silica (cSiO2) onto TiO2 support. The medium strength acidity of Brønsted acid sites was responsible for the improved acrolein selectivity and stability. The other major factors in glycerol conversion and acrolein selectivity were the glycerol content and liquid hourly space velocity. The yield to acrolein was up to 70% and kept almost constant in a 50 h continuous run at 300 °C. The gradual decrease in glycerol conversion was due to the build-up of oxygen-containing carbonaceous materials deposited on the catalyst surface.
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The role of C-reactive protein ratio in predicting mortality in patients with Fournier gangrene
Eray Ismail Cem,Dalci Kubilay,Gumus Serdar,Yalav Orcun,Saritas Ahmet Gokhan,Boz Asli,Rencuzogullari Ahmet 대한대장항문학회 2023 Annals of Coloproctolgy Vol.39 No.3
Purpose: This study aimed to determine the C-reactive protein (CRP) ratio for the survival of patients with Fournier gangrene (FG). Methods: Fifty-two patients with FG between January 2011 and September 2018 were retrospectively analyzed. Data on clinical presentation, Fournier Gangrene Severity Index (FGSI), CRP ratio, management, and outcome were analyzed. The CRP ratio was calculated as preoperative CRP/postoperative CRP value that measured 48 hours after surgical intervention. Possible alternative cutoff points for the FGSI and CRP were determined by receiver operating characteristic (ROC) analyses. The risk factors related to the prognosis were evaluated by univariate and multivariable logistic regression analyses. Results: The mean CRP ratios were 6.7±6.6 in the survivor group and 1.2±0.8 in the nonsurvivor group (P=0.001). FGSI was significantly higher in the non-survivor group compared to survivor group (8.5±2.5 vs. 3.5±2.2, P=0.001). There was a negative correlation between FGSI and CRP ratio (r=–0.51). ROC analysis determined the cutoff value as 1.78 for CRP (sensitivity, 86%; specificity, 82%; area under the ROC curve, 0.90) to predict death. The incidence of death for patients with CRP ratio of ≤1.78 increased 26.7 fold for those with CRP ratio of >1.78 (95% confidence interval [CI], 4.8–146.5; P=0.001). In the multivariable logistic regression model, CRP ratio (odds ratio [OR], 10.3; 95% CI, 1.5–72.2; P=0.019) and FGSI (OR, 17.8; 95% CI, 2.6–121.1; P=0.003) were independent risk factors for death. Conclusion: The CRP ratio is a simple method to use to predict mortality in FG.
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