hydrogen make-up gas, 99.9 mol% H2

Screening proxy hydrogen make-up gas, 99.9 mol% H2, 0.1 mol% CH4, per kg (Atlas unit proxy), GLO: the inventory of 1 kilogram of its reference product, attributional, cut-off.

proxy:hydrogen-methane-makeupReport a problem with this dataset
Research outputAn inventory from a research design at the design maturity its process states, not verified plant data: check its calculation maturity and review status before use. Background activities are referenced by name only; no background data is included. All caveats

What it is

Splits a two-component make-up gas by mass. ASSUMED that its methane is supplied as natural gas; mixing and compression are not counted.

Reference product
1 kilogram of hydrogen make-up gas, 99.9 mol% H2
CAS
not available
Code
proxy:hydrogen-methane-makeup
Activity UUID
not available (the library assigns none; use the code)
Database
cheme-as-code-atlas-preview-c3ab348 (version preview-c3ab348)
Geography
GLO
Time period
not available
Technology
not available
Classification
not available
System model
attributional, cut-off (docs/system-model.md, methodology 1.1.0)

Exchanges per 1 kilogram of hydrogen make-up gas, 99.9 mol% H2

As exported: allocated and scaled to the reference product. Provenance: 2 assumed. Pedigree scores (1 best, 5 worst): reliability, completeness, temporal correlation, geographical correlation, further technological correlation.

InputAmountUnitProvenancePedigreeLinked to
proxy:hydrogen
proxy:hydrogen
mass fraction of H2: 0.999 x 2.016 / (0.999 x 2.016 + 0.001 x 16.043), molar masses of chemicals/chemicals.yaml (hda-1 D-020)
0.9921kilogramassumednonemarket for hydrogen, gaseous, low pressure (hydrogen, gaseous, low pressure, RER) in your background (default ecoinvent-3.11-cutoff)
proxy:natural-gas-m3
proxy:natural-gas-m3
mass fraction of CH4 0.007903 x 1.393728 m3/kg (natural-gas-kg proxy: methane at 0 degC, 1.01325 bar)
0.01101cubic meterassumednonemarket for natural gas, high pressure (natural gas, high pressure, DE, site location) in your background (default ecoinvent-3.11-cutoff)

Elementary flows

No elementary flows are exported for this activity.

Used by

How good it is

Review
not available
Data quality
not available
Mass and carbon closure
Not available: a screening proxy of lci/mappings.yaml, not a dataset
Change report
Not available: this build has no change report against an earlier release.

KPI benchmark positions

Not available: no benchmarked KPI for this dataset.

How to use it

Downloads

A file with this activity alone is not available: each file above is the whole database, and the line under it says how to find this activity there.

import bw2data as bd
from cheme_as_code_lci import install

bd.projects.set_current("my-project")   # holds your licensed background + biosphere3
install("cheme-as-code-atlas-preview-c3ab348.xlsx", background="ecoinvent-3.11-cutoff", location="DE")
activity = bd.get_activity(("cheme-as-code-atlas-preview-c3ab348", "proxy:hydrogen-methane-makeup"))

While any exchange of the database has no mapping, install() writes nothing and only lists the unlinked exchanges. So the last line finds no activity until the gaps are mapped: the download section gives the ways to use the database now.

How to cite

hydrogen make-up gas, 99.9 mol% H2, 0.1 mol% CH4, per kg (Atlas unit proxy), ChemE-as-Code Process Atlas LCI database preview-c3ab348, activity proxy:hydrogen-methane-makeup. Cite the Process Atlas paper (in preparation, 2026), by Artur M. Schweidtmann and Jana M. Weber, and the ChemE-as-Code Process Atlas LCI database version preview-c3ab348.

DOI: none yet (the Process Atlas paper is in preparation)

For the data, cite the Process Atlas paper; for the platform that builds and checks it, the ChemE-as-Code paper.

Schweidtmann, A. M. & Weber, J. M. (2026, in preparation). Process Atlas: an open, git-native, reproducible library and life cycle inventory of chemical processes (working title).

BibTeX
@unpublished{schweidtmann_process_atlas,
  author = {Schweidtmann, Artur M. and Weber, Jana M.},
  title = {{Process Atlas: an open, git-native, reproducible library and life cycle inventory of chemical processes (working title)}},
  year = {2026},
  url = {https://atlas.cheme-as-code.org},
  note = {in preparation}
}

Schweidtmann, A. M. (2026, in preparation). ChemE-as-Code: An Open-Source Platform for AI-Accelerated Chemical Process Engineering (working title).

BibTeX
@unpublished{schweidtmann_cheme_as_code,
  author = {Schweidtmann, Artur M.},
  title = {{ChemE-as-Code: An Open-Source Platform for AI-Accelerated Chemical Process Engineering (working title)}},
  year = {2026},
  url = {https://cheme-as-code.org},
  note = {in preparation}
}