OBJECTIVES The aim of the present study was to determine the peripheral blood mononuclear cell (PBMC) apoptosis in coke oven workers so that we can take effective measures to protect coke oven workers. METHODS The subjects, 129 coke oven workers and 37 warehouse workers (controls), were investigated using a questionnaire to collect information about their age, working years, smoking and drink...

A mechanistic model on catalyst deactivation by coke formation in a continuous stirred tank reactor (CSTR) has been developed the paper. Catalyst was treated as surface reaction. Four reaction mechanisms representing through different routes were proposed. The evolved system of ordinary differential equations (ODEs) solved numerically using MATLAB. This approach validated applying it to skeleta...

Catalyst deactivation involves a complex interplay of processes taking place at different length and time scales. Understanding this phenomenon is one the grand challenges in solid catalyst characterization. A process contributing to carbon deposition (i. e., coking), which reduces activity by limiting diffusion blocking active sites. However, characterizing coke formation its effects remains c...

Ni/Al-HMS/HZSM-5 catalysts with varying amounts of Si/Al ratios were prepared via the impregnation method and evaluated for the hydrogenation of benzene at 130−190 °C. To study the catalyst characterization, various methods were used as X-ray diffraction, X-ray fluorescence, Fourier transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, temperature-programmed des...

The dusty challenge Obtaining reliable level measurement has traditionally been a severe challenge because cement production is such a dusty process. During homogenization, for example, silos are continuously filled and emptied, and the component materials are constantly aerated to ensure good mixing. This creates a tremendous amount of dust that makes it difficult to obtain reliable readings w...

Ñ Anticoking Coatings for High Temperature Petrochemical Reactors Ñ Coke deposition is a major problem for several refinery and petrochemical processes, among which steam cracking for ethylene production. Decreasing coking rates will reduce decoking frequency and will also decrease heat transfer degradation. For these processes, a means of reducing coking phenomena is the application of anticok...

Air pollution in Poland and particularly in Silesia is among the worst in Europe. Many coal mines and coke oven plants are located in this area, representing a major source of carcinogenic polycyclic aromatic hydrocarbons (PAHs). We quantitated the PAH exposure level in air samples using personal sampling devices, collected urine samples from the same individuals, and measured 1-hydroxypyrene w...

The formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporary deactivation of catalyst, necessitating regeneration steps, affecting throughput, and resulting in partial permanent loss of catalytic efficiency. Yet, even to date, the coke molecule distribution is quite challenging to study with high spatial resolution from surface to bulk of the catalyst parti...

OBJECTIVE This study aimed to assess the impact of in vitro erosion provoked by different cola-based drinks (Coke types), associated or not with toothbrushing, to bonding to enamel. MATERIAL AND METHODS Fifty-six [Corrected] bovine enamel specimens were prepared and randomly assigned into seven groups (N=8): C- Control (neither eroded nor abraded), ERO-RC: 3x/1-minute immersion in Regular Cok...

OBJECTIVES The objective of this study was to assess sperm quality and deoxyribonucleic acid (DNA) integrity of coke oven workers exposed to polycyclic aromatic hydrocarbons (PAHs) as compared to control subjects. MATERIAL AND METHODS The coke oven workers (N = 52) and administrative staff (N = 35) of a steel plant served as the exposed and control groups, respectively. Exposure to PAHs was a...