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Abstrak :
The effect of precipitant and ultrasonic over Ni7CeO,-MgO-La,0/A503 catalyst was studied in an atmospheric fixed-bed reactor for partial oxidation of methane. Two types of precipitant used in this work were Na2C)3 and NH4OH2 and the length of ultrasonic iradiation was 60 minutes (1 hour). The bulk surface area, nickel particle diameter, nickel dispersion and morphology of the catalysts were investigated by various characterization techniques, including BET] XRD, H; chemisorption and SEM The partial oxidation of methane to syngas was done at 800 ?C atmospheric pressure and the feed ratio (CH/01) was 2 : 1.2. It was found that catalysts prepared by using NH4OH2 precipitant have pore size that larger than those of catalysts prepared using Na,CO, precipitant. The effect of ultrasonic on the catalysts showed that ultrasonic irradiation enhanced the surface area of the catalyst and the nickel dispersion. SEM analyses shown changes of the catalyst morphology, i.e. the particle of the catalyst became smaller and more uniform because of the ultrasonic irradiation. Catalyst prepared using NH,0H precipitant and irradiated shown the best performance with 96% methane conversion.

Abstrak :
Menurut perkiraan International Labour Organization (ILO), di tingkat global lebih dari 2,78 juta orang meninggal per tahun akibat kecelakaan kerja atau penyakit terkait pekerjaan. Berdasarkan data yang dirilis oleh BPJS, kecelakan kerja di konstruksi meningkat dari 114.000 di tahun 2019 menjadi 177.000 kecelakaan ditahun 2020. Penelitian ini bertujuan untuk mengetahui tingkat kematangan budaya keselamatan pada pekerja di PT. XYZ . Penelitian bersifat semi kuantitatif dengan design penelitian deskriptif. Data yang dikumpulkan dari hasil FGD, Kuisioner, review dokumen & Observasi kemudian dilakukan analisa secara mendalam. Terdapat 19 variabel yang akan diuji dalam penelitian ini. Berdasarkan hasil pengukuran tingkat kematangan budaya keselamatan didapatkan PT. XYZ berada di tingkat calculative dengan mayoritas variabel berada pada tingkat calculative kecuali variabel penghargaan K3L, pelatihan & kompentensi, penerapan dan penggunaan standart berada pada tingkat reactive. Berdasarkan dengan  kriteria 20 variabel yang diuji dalam penelitian ini tingkat kematangan budaya keselamatan PT. XYZ berada ditingkat calculative yaitu masuk kedalam titik awal dalam menuju budaya selamat. ......According to estimates of the International Labour Organization (ILO), at the global level more than 2.78 million people die per year from occupational accidents or work-related diseases. Based on data released by BPJS, work accidents in construction increased from 114,000 in 2019 to 177,000 accidents in 2020. This study aims to determine the level of maturity of safety culture in workers at PT. XYZ. Research is semi-quantitative with a descriptive research design. The data collected from the results of the FGD, Questionnaire, document review & Observation was then carried out an in-depth analysis. There are 19 variables that will be tested in this study.  Based on the results of measuring the level of maturity of safety culture obtained by PT. XYZ is at the calculative level with the majority of variables being at the calculative level except the K3L reward variable, training &compensatory, application and use of the standard are at the reactive level. Based on the criteria of 20 variables tested in this study, the maturity level of pt. XYZ is at the level of being calculative, which is to enter the starting point in the direction of a culture of safety.